1. When deeply absorbed in work,  he often was, he would forget all about eating and sleeping. (用适当的介词或副词填空)
【考点】
关系代词引导定语从句的用法; 非限制性定语从句;
【答案】

您现在未登录,无法查看试题答案与解析。 登录
语法填空(单句) 普通